IMPOSSIBLE QUESTION:
If you eat this, a new study recommends that you eat it within 12 hours, never more than after 30 hours; what is it?

You would typically eat this outside

ANSWER:
If you are going to eat snow, a new study recommends that you eat this within 12 hours of it falling, never more than after 30 hours.

Congratulations to Wayne Roberts of Cambridge City, IN for being the first to correctly answer the Impossible Question!